This exceptionally strong block features the performance Orbit sheave with captive Acetal ball bearings for side thrust loads, eliminating the need for side retainer plates. This reduces weight and offers a wider bearing surface that can accommodate longer Torlon(r) needles, achieving a super high strength-to-weight ratio. Features Sheave: 60 mmThe highest strength-to-weight ratio Minimal friction loss, especially when working at high loads Totally reliable and trouble free performance Simplicity of design and construction to facilitate maintenance and servicing Elegant, functional styling and finish Lockable swivelling head post High strength forged shackle Materials Fully machined Alloy cheek plates Alloy sheaves with captive ball races Torlon needle rollers Carbon black Acetal ball bearings Forged grade 17-4PH stainless steel shackles Grade 316 stainless steel head post