Ryobi A99LM2 Door Latch Installation Kit for Accurate Chiseling and Scoring BUILT-IN SCORING AND CHISEL TOOL: This kit will help you minimize the amount of tools you bring to the jobsite NO MEASUREMENTS REQUIRED: The onboard 90-degree guide helps you feel confident in your measurements ROUND OR SQUARE LATCHES: A reversible latch mortiser offers clean scores for both round and square latches ON BOARD STORAGE: Keep your bits, guard, and latch mortiser safe with built-in storage TWO INCLUDED DRIVER BITS: [1x 1-inch PH2 bit] [1x 1-inch SL 8-10 bit]