The Claw Series is designed to prevent the user from over tightening the pole clamp screw and accidentally crushing or cracking the pole. The clamping function is limited so over-tightening cannot occur. These clamps are compatible with our existing Quick-Release cradles for most popular data controllers or you can pair it with the Claw Quick-Release Cradle for your collector/controller. Designed to fit a pole diameter of 1.25 in (32 mm), however a 1 inch (25.4 mm) pole can be used. Features a 40-minute Vial and Compass built on to the clamp.