HHIP High Precision Steel 990 Piece Pin Gage Library (MO-) .011-1.000" Custom metal drawer system included. Accuracy is -0.0002"/+0.0000". .001" set increments with sizes marked on each pin gage. Made of tool steel hardened to HRC60-62. Finish to 10 micro or better. Class ZZ. Overall length of each pin is 2". 8 pin gage handles are included. Use these pins to check locations, measure hole sizes and depths, go and no-go gaging, setting micrometers, and checking distances between holes.