Sizes: STD, .25, .50 Oil Clearance: Standard Half Type: Upper & Lower Material: Tri-metal Min Std Shaft Size: 2.1243in / 53.958mm Max Std Shaft Size: 2.1251in / 53.978mm Min Std Tunnel Size: 2.3228in / 59.000mm Max Std Tunnel Size: 2.3236in / 59.019mm Max Wall at Crown: 0.0985in / 2.502mm Max Overall Length: 0.728in / 18.49mm Notes: Set contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower.
