Product Overview: 12 Pcs Aluminum Kayak Adapter & O-Rings for 1/2" Wide Head T-bolts Compatible Models: Kayak Adapter Fit for YakAttack MightyBolt, RAM, Scotty & other 1/2" Wide Head T-bolts, Compatible with FeelFree, Jonny Boats, Seastream and 3 Waters kayaks equipped with Uni-Track and Uni-Bar systems Product Function: Fit well and make adding 1/2" T-bolts to a unitrack easy, creates compatibility between the Uni-Track and Uni-Bar, adjust the sliding speed of the assemble part on the track, used them to hold rod holders onto the rails Premium Material: Made of high quality aluminum material, strong and wear-resistant, not easy to rust or corrode, UV resistant, able to be used in extreme marine environment, long service life Easy to Install: Just insert the adapter plate into the screw base and placing the O-ring into the screw, which can be quickly and conveniently installed even by non-professionals 12 Pcs Kayak Adapter & O-Rings, Fit for YakAttack MightyBolt, RAM, Scotty & other 1/2" Wide Head T-bolts, Compatible with FeelFree Uni-Track & Uni-Bar Systems, Jonny Boats, Seastream, 3 Waters Kayaks