C.R. LAURENCE F2771 CRL Black Sash Lock with 2-1/4" Screw Holes for Acorn Windows. This CRL Window Sash Lock has a 1/2 inch (12 millimeter) drop dimension on tongue which engages fixed rail of opposing sash. The lock does not use a separate keeper. Fits on Acorn windows.. Part Numbers Variations: F2771
