The DFR551 is a cordless auto-feed screwdriver from the Makita 18V LXT range The Makita DFR551Z is a brushless auto-feed screwdriver that will accept screws between 25-55mm. It features push drive technology which delivers increased efficiency, longer run time and lower noise for drywall fastening. The motor starts only when the fastener is engaged with the workpiece, so battery power is used more efficiently for a significantly longer run time. It has been ergonomically designed with a soft grip handle for optimum user comfort and features a screw feeding mechanism to improve durability and reduce screw fall. Features: Brushless motor Ergonomically designed handle with soft grip. Push drive technology One-touch casing attachment/removal reduces the trouble of reversing and replacing a bit Screw feeding mechanism redesigned to improve durability and reduce screw fall Lock-on function Trigger-Lock Reversing switch Variable speed control Anti-restart function Specification: Voltage: 18V Drive shank Hex: 1/4" Screw Size Range: 25 to 55mm Noise sound pressure: 74 dB(A) Noise K factor: 3 dB(A) No Load Speed: 0 - 6,000 rpm Vibration K factor: 1.5 m/sec² Vibration: 2.5 m/sec²