Schaefer 51 mm 5 Series Block - Ball Bearing, 506-05 Brand_Gill Pressure on the line engages

Pressure on the line engages the ratchet mechanism

Not all control line blocks on a boat require two-stage bearings that evolve from years of R&D and the expense that goes with them

It's specially designed and constructed for long service life

The larger sheave diameter works well with lines up to 9/16"

With its superior grip and durability

Schaefer 51 mm 5 Series Block - Ball Bearing, 506-05 Brand_Gill Pressure on the line engagesLike the 5 Series blocks, but with Schaefer's ball bearing sheave. Curved ball races allow Schaefer ball bearing blocks to take higher loads than other similarly sized blocks. 5 Series blocks offer small to medium sized cruising and racing yachts an extremely high strength weight ratio resulting in a highly refined and reliable block. The versatile universal head design has a three way built in locking feature and accepts Schaefer "universal" adapters