Maintenance index for drills. 19-piece index holds every drill needed for frequent maintenance work in one handy index case. Holds the following drills: 1/16", 5/64", 3/32", 1/8", #29, #25, 5/32", #21, 3/16", #7, 7/32", 1/4", #F, 5/16", #U, 3/8", 27/64", 7/16", 1/2".