The Rock Exotica Omni-Block 1.5 Double can replace a conventional pulley, carabiner and swivel - its lighter, less expensive and saves valuable vertical space. The smooth, ball bearing action of the Omni eliminates twisting of the rope in rigging systems. This precision fabricated alloy block has a unique button-activated release feature that allows instant access to the sheave for mid-line attachment. The milled alloy attachment eye is large enough to accept most carabiners and snaps. Accepts rope up to 13 mm. Bottom becket on the Omni Double ready for use in a fiddle block system. Made in the USA.