Bosch SG450AF. . Features: Compact ergonomic design with contoured grip increases comfort and control to drive screws all day. The Posi-Lok nose piece is both easy to use and remove and positively locks the depth setting when removed. Auto-Feed system has a screw capacity of 1 in. to 2-1/8 in. for increased productivity. High-torque gearbox drives screws into hard woods and materials. Interchangeable bit tip and TEK Nose for added versatility with a single tool. Variable-speed trigger with forward-reverse lever for increased control. Plastic gear housing provides improved balance and a lightweight design. Includes an auto-feed attachment that holds screw strips and feeds into work contact elements.