Hitachi W6VB3SD2 SuperDrive Collated Screw Fastening System with Extension Tool free depth adjustment: No need to reach in the tool box to change screw depth Wide Fastener Range: The W6VB3SD2 SuperDrive system if ready for work given it fastens screws from 5/8" to 3" and screw diameters from #6-#12 20" extension allows you to work from a grounded standing position without having to get down on the floor or stand on a ladder SuperDrive Sub-Floor/Decking Collated Screw Gun (Certified Refurbished) Screw Capacity:5/8 inch - 3 inch