Commercial Grade Bow Shackles Specifications SIZE STOCK NUMBER PIN DIAMETER WEIGHT/PIECE 3/16″ CGSPA187 1/4″ .05 lbs. 1/4″ CGSPA250 5/16″ .12 lbs. 5/16″ CGSPA312 3/8″ .19 lbs. 3/8″ CGSPA375 7/16″ .31 lbs. 7/16″... MSRP: Was: Now: $1.60 - $10.00 Choose Options