Sailboat Mast Halyard Block Pulley Dual Sheave

Stainless steel dual sheave sailboat halyard mast block.
The block is designed to be recessed into the mast and has 2 dual nylon sheaves.

The cutout required is 3-3/4" x 3/4" and requires 1-3/4" of depth sheaves will handle uo to 3/8" rope.