THIS ITEM IS A 5-PIECE SET OF JACOBS RUBBER FLEX COLLETS FOR LATHE APPLICATIONS. THE SET INCLUDES SIZES J910, J911, J912, J913, AND J914, PROVIDING A CLAMPING RANGE FROM 1/16 INCH TO 5/8 INCH. MANUFACTURED BY JACOBS, THESE RUBBER FLEX COLLETS ARE DESIGNED FOR PRECISION TOOLING TASKS ON A LATHE.