The anchors make it possible to tie down ANYTHING from furniture to motorcycles to equipment to musical instruments to refrigerators... Solid clips with a rust resistant finish for long-term use. THESE O-RINGS HAVE SPRING FITTINGS welded on to the metal. They can only be placed in slots of E-Track systems (NOT INCLUDED), unless you want to weld them directly onto your truck, making them permanent. ONCE YOUR O-RING is clipped into a slot on an E-Track rail or single (NOT INCLUDED), use it to anchor any tie-down: chains, ratchet straps,cam buckle straps, motorcycle tie-downs, tarp straps, bungee cords, rope, kayak tie-down straps, etc. The rings have a 2 inner clearance. E-TRACK NOT INCLUDED. Assembly break strength of 4,500 pounds and a SAFE WORKING LOAD LIMIT OF 1,500 POUNDS. These rings are steel galvanized to protect against corrosion and rust. ANTI-CORROSION: This durable E Track Ring Tie down Anchor is made out of hardy steel that is galvanized with color zinc to prevent corrosion and rust, can be used in adverse weather and withstand harsh conditions. perfect for outdoor use. Colour:Photo Color Material:Carbon Steel Package Contents: 4 x E-Track O Ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.