Quick Release Steel Collar - 1.0 LB. Each | COAST FITNESS 1.0 LB. EachO.D: 2.835"I.D: 2"Height: 1.4" https://static.wixstatic.com/media/a14dae_c936e880205441708835b9f51a149860~mv2.png/v1/fit/w_500,h_500,q