1-3/8" X 1-3/8" One-Piece Split Clamp-Type Rigid Shaft Coupling, SteelMate two shafts with zero backlash Smooth bore protects shafts from damage Superior torque capacity over set screw type couplings Available with straight through or stepped bores Offered in High Strength, Low Profile and Heavy Duty styles Designed for aligned shafts, the 1 Piece Clamp Type Coupling makes two shafts function as one. Clamp Type Couplings are available in straight through or stepped bores. They are precision machined, non marring, easy