Easy-to-use design lets you secure the plunger tube to the frame without fear of tube crush or expensive frame damage. Adjustable to fit all makes of frames and tubes for both installing and re-tightening. Hardened crimping point assures long tool life. Plunger Tube Support slilps inside plunger tube and prevents compression damage while tube is being staked to frame. Steel construction provides a rigid structure and many years of use. Mfg: Brownells