Jacob Spindle Nose Lathe Collet Set Rubber Collet Jacob Rubber Collet Jacobs Rubber-Flex Collets Set 5 of 6; J915, J916, J917, J919, J920 missing J918 J915 : 5/8-3/4 J916 : 3/4-7/8 J917 : 7/8-1 J919 : 1-1/8_1-1/4 J920 : 1-1/4_1-3/8 set came from a local machine shop in OKC missing one size.