This three prong clamp holds objects ranging from 0.80 to 89mm securely and safely. Two separate adjustment screws ensure even, precise pressure on glass to minimize the chance of breakage. Clamp is easily adjusted to vary holding angle and distance from the stand. Jaws are coated with non-slip vinyl. Length: 27cm. Grip Size: 89mm. Extension Arm Length 15mm. Extension Arm O.D.: 13mm. Kimble Chase #: 675700-0089.