Fowler's Bluetooth Holematic Pistol Grip Groove Sets offer extended travel with fixed anvils. The pistol grip handle incorporates a constant measuring pressure to eliminate operator "feel". Sizes Included: Anvil Step Height: Anvil Contact Width: 3/4" - 1" 0.108" 0.079" 1" - 1-3/8" 0.217" 0.079" 1-3/8" - 2" 0.157" 0.079" Features: • Coolant proof, dust proof - IP67• Pistol grip handle for FAST measurements• Resolution: 0.00005"/.001mm, direct in/mm conversion• Error free bluetooth data transfer• Includes depth stops and UKAS certified setting rings• Special sizes, profiles and depth extensions available to measure any bore feature