10 Series Fiddle Block with Stainless Steel cheeks. Works with 10-55 for a 4:1 purchase. Delrin(tm) sheaves run on Nomex(tm)/Teflon(tm) bearings for low-friction and high safe working loads. Unique design features a single top sheave and two in-line sheaves to spread the load reducing friction and chafe. Stainless Steel D shackle run on a swivel head that may be locked in plate to avoid line twist. Bolted construction allows for easy maintainence.