Standard stainless steel wide D shackle. Proboat Standard Shackles are an economical alternative to a fully forged shackle. Fully guaranteed they offer exceptional quality and value. Featuring round bodies and forged pins for extra security, this wide range of shackles is available in Bow, D, wide Jaw, key pin, Allen head and twisted versions in sizes from 4mm up to 22mm diameter. We also have a range of galvanised shackles in bow and D shape from 5mm up to 32mm diameter. Manufactured from AISI 316 stainless steel.