This sliding window pin lock is constructed of steel and comes in an aluminum plating. This is the shortest lock pin manufactured, and it is designed to fit on older style, metal framed windows - usually of single pane glass with very thin sash frame thicknesses. This pin lock features a holder where it can be stored when not in use, and a chain connecting the pin lock to the holder to avoid misplacement of pinch Window pin locks like these are designed to securely lock the sliding sash when in a closed or ventilating position, preventing the active panels from sliding on both horizontal and vertical sliding windows. Installation of this security device requires drilling into the sash frame with a 1/8 inch diameter drill bit, and caution should be used to avoid breaking glass with drill bit. Note: THIS WINDOW PIN LOCK IS DESIGNED TO FIT ON OLDER STYLE, METAL FRAMED WINDOWS - USUALLY OF SINGLE PANE GLASS WITH VERY THIN SASH FRAME THICKNESSES. Similar window pin locks of longer lengths include model numbers U-9858 (2-3/8 inch long) and U-11070 (2-3/4 inch long). Required tools for installation may include the following: Safety glasses, measuring tape, pencil, Phillips head screwdriver, drill, and a 1/16 inch and 1/8 inch drill bit. Installation instructions and fasteners are included with this item.