Fowler 52 Piece Gage Ball SetFeatures: Ball gages are ground and lapped chrome steel Hardened to 63RC. Grade 24 accuracy AFBMA certificate Within . 0001" of actual size. Sphericity within . 000025". Surface finish to 1. 5 micro inches. 52 438 766 Set includes 26 pairs Pair sizes in inches: 1 8, 9 64, 5 32, 3 16, 7 32, 1 4, 9 32, 5 16, 11 32, 3 8, 13 32, 7 16, 15 32, 1 2, 17 32, 9 16, 19 32, 5 8, 21 32, 11 16, 23 32, 3 4, 13 16, 7 8, 15 16 and 1" 52 438 777 Set includes 25 pairs

• #1 - #60 number drill

• Face Dia

• Includes a spanner wrench and a case

• Range/Revolution:

• Scale surface is satin chrome finished to prevent glare

• Friction/Ratchet thimble assures you of consistent readings at all times

Size: 12"/300mm

Federal specifications for accuracy

All lighting and magnification conditions are also recorded and re-created as each feature is visited

• Squares fully hardened to Rockwell 55C

• Shockproof design prevents dial backlash

• All sliding surfaces are raised to prevent defacement and wear of graduations