1-1/4" One-Piece Split Clamp-Type Shaft Collar, Stainless Steel" Smooth bore protects shafts from damage Superior holding power over set screw type collars Offered in High Strength, Low Profile and Heavy Duty styles Stocked in a variety of materials 1 Piece Clamp Type Shaft Collars are for use on standard round shafts, hard or soft, as well as on thin wall tube or over a split hub. Precision machined, non marring, easy to adjust, with high clamping power, they are stocked in the following materials: Steel