Welcome to Defender Canada! 
Schaefer 3 Series Cheek Block - 300-30 Item # 880870
Description
Schaefer curved base cheek block fits up to 2 inch diameter spar sections for easy mounting. Ideal for control lines on dinghies and small daysailors. Ball bearing sheave provides a low friction lead.
Specifications:
- Maximum line size: 7/16" (11 mm)
- Safe working load: 1000lbs. (454kg)
- Dimensions: 3-11/16" (94mm) L x 1" (25mm) W x 3/4" (19mm) H
- Hole centers: 3-3/16"(94mm)
- Sheave diameter: 1-7/16" (37mm)
- Required Fasteners: 4 x #10
- Weight: 2.1oz (62g)