Fit for Sliding Windows - Ideal for vertical sliding windows made of wood, vinyl, or aluminum, including single and double-hung sash types with each factory sealed package Improves Window Security - Replaces worn or missing locks to help restore function and enhance home or office safety and protection Strong Cam-Action Lock - Cam-style mechanism pulls meeting rails tightly together for a secure seal and added security Durable and Easy to Install - Diecast zinc with white finish; mounts with 2-1/4 inch hole spacing for the lock body and 2-3/16 inch on center for the keeper Note - Please refer to the line art drawing for dimensions and compare with your needs before purchasing (Not Universal)