Ronstan Series 25 Ball Bearing Orbit Block – Becket Swivel Shackle [RF28100]

Series 25 Ball Bearing Orbit Block – Becket & Swivel ShackleSingle sheave ball bearing block with becket hub and swivel shackle head.Series 25 Ball Bearing Orbit Blocks, delivering superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications.Designed with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstans renowned high compression strength acetal bearing system, the Series 25 BB Orbit Blocks are a lightweight yet durable solution, ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 meters.Each block has a stainless steel hub for versatile lashing attachments and through-sheave becket functionality, making them adaptable to a wide range of rigging setups. The hub accommodates up to 4mm (5/32″) lashing and ensures maximum efficiency without compromising reliability.Features:2-stage ball bearing system.Suits up to 8mm (5/16) lines.Hollow hub for becket take-off.Lashing blocks suit up to 4mm (5/32) lashing.Specifications:Max. Rope diameter (in): 5/16M.W.L. (lb): 500Sheave diameter (in): 1B.L. (lb): 990Weight (oz): 0.6Applications:Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft).Control lines.Cascading vangs.Leech lines & cunninghams.Materials:Frame/cheeks: Toughened, glass fibre reinforced nylon. BB Sheave and balls: high compression strength acetal.