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: 2" - 2-5/8" 0.315" 0.118" 2-5/8" - 3-1/4 0.315" 0.118" 3-1/4" - 4" 0.413" 0.118" 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