This is the adjustable file/tool handle you need for holding files, reamers, hacksaw blades and other handled tools. Created and manufactured by General Tools its exclusive rustproof steel parallel clamping jaws grip the entire length of the inserted tang to prevent slipping. The large, quick adjusting knurled knob ensures positive locking. This is the perfect handle for all of your tools! It even conform to government specifications NN-H-0085.