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These high-performance control blocks are engineered for free-running systems, featuring Delrin ball bearings that allow cars to instantly adjust and release under load. The assembly secures directly to the track, eliminating the need for additional drilling. Tough one-piece bases and cam arms are machined from a single piece of aluminum for superior durability. Compact, low-friction components combined with Carbo-Cam cleats ensure minimal weight. High-performance end controls support the installation of 2:1 to 4:1 purchases.
End Controls: Allow the installation of 2:1 to 4:1 purchases.
Ball Bearings: Delrin ball bearings enable instant adjustment and release under load.
Track Mounting: Assemblies secure directly to the track, eliminating additional holes.
Construction: One-piece bases and cam arms are machined from a single piece of aluminum.
Weight: Compact, low-friction components and Carbo-Cam cleats keep weight minimal.
Specifications
• Brand: Harken
• Reference: 1633
• Sheave Ø: 40 mm
• Length: 114 mm
• Width: 100 mm
• Maximum line Ø: 10 mm
• Fasteners: 8 PH mm
• Maximum working load: 272 kg
• Breaking load: 680 kg
• Height above track: 50 mm
• Weight for pair: 1020 g
• Purchase: 3:1 / 4:1






