The JET Tools 1/4" Air Screwdrivers, Nos. R12 JAT-660 and R12 JAT-661, have a composite housing that improves balance and reduces weight. The tools have durable ball-bearing construction and provide control with variable-speed triggers. The Air Screwdrivers feature a quick change chuck that accepts standard 1/4" hex bits, allowing the tool to easily adapt to any manufacturing or fabrication need. There also is a side-mounted forward/reverse switch. The R12 JAT-660 is capable of 800 rpm while the R12 JAT-661 is capable of 1,800 rpm.