how does this work? Is the black part supposed to be a magnet? There is no way to engage the handle with the other part to secure the window.

I bought these for pull in basement windows. Work really well, no magnets. Lock windows securely.

Do these latches work on windows that open inward?

These are for windows that open outward but I think you can make it work if install in on a side that doesn't open.

What stops the window from being pushed in from the outside? Pictures of your install would be great.

The rectangle black piece is inserted into the strike rectangle opening. It sticks up. The handle tip has a small hook on it. When handle is turned closed, the hook goes behind the raised black piece. This is what keeps it closed. This item is for an outswing window so if it were to be an inswing window, there would me nothing to stop it.

Whats model #for right handle

Matching right hand casement operator is Prime-Line part H 3821 https://www.amazon.com/Prime-Line-Products-3821-Off-Set-Casement/dp/B000VYEW3Q

Prime Line Products H 3820 Casement Locking Handle Left Hand

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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€ 39.61

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Lock in style and security with every window swing!

SLEEK WHITE FINISH - Contemporary white coating blends effortlessly with any window style.
DURABLE DIECAST CONSTRUCTION - Robust metal build guarantees long-lasting security and reliability.
OFFSET BASE FOR EASY INSTALLATION - Mounting holes offset by 13/16 inch for perfect alignment with modern window frames.
EFFORTLESS REPLACEMENT OPERATION - Quick install with existing screws and smooth locking action restores window functionality instantly.
PRECISION FIT FOR LEFT HANDED WINDOWS - Designed specifically for left-hand casement windows ensuring seamless operation.

The Prime-Line H 3820 Casement Locking Handle is a left-handed, diecast metal locking handle featuring a 1.5-inch center-to-center hole spacing and an offset base for precise fit on contemporary metal-framed windows. Finished in sleek white, it offers durable, easy installation and reliable locking performance, making it the perfect replacement handle to restore smooth window operation.

Specifications

ASIN	B000VYD6FQ
Additional Features	Easy to Install
Brand	Prime-Line
Brand Name	Prime-Line
Center To Center Spacing	1.5 Inches
Colour	White
Country of Publication	USA
Customer Package Type	1
Customer Reviews	4.5 out of 5 stars 290 Reviews
Exterior Finish	White
Global Trade Identification Number	00049793038203
Hand Orientation	Left
Handle Material	Metal
Handle Type	Pull Handle
Included Components	Screwdriver
Indoor Outdoor Usage	Indoor
Item Dimensions L x W	38L x 89W Millimeters
Item Type Name	handle
Item Weight	91 g
Lock Type	lock_type
Manufacturer	Prime-Line Products
Manufacturer Part Number	H 3820
Manufacturer Warranty Description	Contact seller of record
Material	Diecast
Material Type	Diecast
Metal Type	metal_type
Model Number	H 3820
Number of Items	1
Product Dimensions	38L x 89W Millimeters
Product Finish Type	White
Room Type	room
Shape	L-Shaped
Specific Uses For Product	Locking,Locking Handle
Style	Contemporary
Style Name	Contemporary
Theme	Christmas
UPC	049793038203
Unit Count	1.0 Count

Reviews

C**2

Nice replacement handle

Used to replace a broken lever handle on my anderson basement windows. Perfect fit - I used the window's existing screws as they will anchor better for my purposes.

25.04.2026

T**5

Window can open and close

I have needed this for a long time, finally got it and now I can open and close window properly

3.07.2022

S**A

Good product

Works well

1.06.2026

T**M

Great Replacement

I needed a replacement handle, and this was exactly what I needed. Works perfectly!

10.04.2026

C**E

Perfect fit, as advertised

As advertised a perfect fit on an old aluminum casement window. A little pricey but did the job

1.10.2025

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