Open and closes with Allen key.
Integrated hinge for opening and closing, Allen closure.
Get your easy-to-use Hinged Ball Stretchers

Height x inside Diameter x Weight/Gr
14 x 32 x 190gr
14 x 36 x 210gr
14 x 40 x 230gr

20 x 32 x 277gr
20 x 36 x 290gr
20 x 40 x 337gr

30 x 32 x 425gr
30 x 36 x 433gr
30 x 40 x 498gr

40 x 32 1 x 567gr
40 x 36 1 x 581gr
40 x 40 1 x 640gr

56 x 32 1 x 690gr
56 x 36 1 x 785gr
56 x 40 1 x 700gr

Made of stainless steel surgical grade 304.