The 16 mm is Harken’s smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load.Matches Laser XD Harken BlockLS-91512SpecificationsSheave diameter: 5/8″ (16 mm)Maximum line diameter: 7/32″ (5 mm)Maximum working load: 250 lb (113 kg)Breaking load: 1200 lb (544 kg)Length: 1 1/8″ (29 mm)Weight: 0.38 oz. (11 g)