Bessey SQ4 6-Inch Super Quick All Steel Sliding Arm Clamp 9 times faster than a "C" Clamp ; Allows 6 1/4" for loading & unloading of parts clamped that are 6" Standard deep throat has greater reach and eliminates the need for regular and deep throat C-clamps Manufactured to Bessey's high quality standards and includes a standard swivel mount pad for better grip Tempered steel sliding arm, drop forged and electrogalvanized for added strength and an infinite life Rail, fixed jaws and pressure plate heat-formed in one piece from cold drawn profiled steel optimized for high static stress loadings