High-performance end controls allow the installation of 2:1 to 4:1 purchases. Designed for high-performance, free-running systems, Carbo control blocks with Delrin® ball bearings let cars instantly adjust and release under load. Assemblies secure to track, eliminating additional holes. Tough one-piece bases are machined from a single piece of aluminum.Delrin is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.Specifications:- Footnote: Fasteners included - Sheave Ø (mm)40 mm- Sheave Ø (in)1 9/16 in- Length (mm)114 mm- Length (in)4 1/2 in- Width (in)1 15/16 in- Width (mm)49 mm- Height above track (mm)33 mm- Height above track (in)1 5/16 in- Weight for pair (g)574 g- Weight for pair (oz)20 oz- Maximum line Ø (mm)10 mm- Maximum line Ø (in)3/8 in- Maximum working load (kg)159 kg- Maximum working load (lb)350 lb- Breaking load (lb)875 lb- Breaking load (kg)397 kg- Purchase2:1 / 3:1 - Fasteners (mm)8 PH mm