This three prong clamp features an open yoke design for minimum contaminant build-up and easy cleaning. Open yoke allows the full depth of the clamp to be used unobstructed by the yoke, springs or adjusting screws. Two separate adjustment screws ensure precise pressure on glass. Supplied with nonslip vinyl coating on jaws and fiberglass finger covers. Length: 22cm. Grip Size: 57mm. Extension Arm Length 13mm. Extension Arm O.D.: 13mm. Kimble Chase #: 675710-0057.