Collets 1-1/4″ O.D. x 1″ I.D x 4-1/4″ Long (Pair). For power and sailboats with standard length strut. All collets are precision laser cut, ceramic tumbled and Zinc plated for corrosion resistance. These collets are used for all 3/4″, 7/8″ and 1″ propeller shafts with 1-1/4″ strut bore. For 3/4″ and 7/8″ prop shafts use non-metallic shaft spacers.