Individual Steel Gauge Block , Grade 1 , 8.0 mm IC Insize , 4101 - B8 Individual Steel Gauge Block Grade 1 , 80.0 mm IC Insize , 4101 - B80 Individual Steel Gauge Block , Grade 1 , 8.5 mm IC Insize , 4101 - B8D5 Individual Steel Gauge Block , Grade 1 , 9.0 mm IC Insize , 4101 - B9 Individual Steel Gauge Block Grade 1 , 90.0 mm IC Insize , 4101