Ronstan Series 30 Ball Bearing Orbit Cheek Block RF35151 2381 The patented bearing system uses

The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load

Block headpost fits into socket without shackle

ClearStart™ watches and timers are water resistant rated at 5ATM and highly shock resistant

Length 78mm  3 inch

JOHNSON / EVINRUDE 5033539

Ronstan Series 30 Ball Bearing Orbit Cheek Block RF35151 2381 The patented bearing system usesSingle sheave cheek block. Requires 2 x 4mm (5 32") fasteners. FEATURES Base suits curved mounting base. Lightweight. Highest working load in its class. Low friction 2 stage ball bearing system provides consistent performance over the full working load range. APPLICATIONS Mainsheet systems and spinnaker sheets on dinghies to 5m (16ft). Halyard, vang and backstay applications on boats to 5m (16ft). Control line applications on larger yachts. Primary