Jacobs J421 RUBBER-FLEX Tap chuck Collet Capacity-- 0.139 - 0.257 (3.5 - 6.5 mm)

Parallel jaw insert surfaces exert uniform, accurate gripping force up to three times greater than can be achieved with split-steel collets.Each collet accepts and precisely centers a wide range of both decimal or metric diameters to speed setups and increase machining productivity.Durable one-piece construction. Synthetic rubber retains flexibility and resists deterioration from heat, coolants and cutting compounds.Steel jaw inserts precision ground to assure maximum gripping accuracy. Hardened