1" , 1- 1/8" , 1-1/4" (SAE)
25mm , 30mm and 28mm saildrive (ISO)
SAE 1:16
ISO 1:10
SAE - BSW 3/4" or 7/8"
ISO M20 or M16 x 1.5 Saildrive M16 or M20 x 2
SAE - 1/4" or 5/16"
ISO - 6x6 or 8x7mm