High -quality circular size measurement tools, our circular measurement instruments and round size measurement instruments are carefully made of high -quality stainless steel, which has unparalleled durability and service life. First place the ring on the stepped chip, select the suitable size of the ring, and then put the expansion on the base.Then insert the cone rod and gently hit the top with a hammer.Just wipe the other end to remove the core axis. Farewell to the tedious and annoying of adjusting the dimensions, just use the ring core shaft.This jewelry ring size regulator to seamlessly fit your working space and make your work easily in a short time. About 25 mm in diameter, 22 mm thick, holes: 12.5 mm.1 piece; flat circular size: diameter about 24.5 mm, 95 mm thick, hole: 12 ~ 13 mm.1; our ring measurement tool can be easily stored when not in use, and maximize your working space efficiency. The expansion core rod can provide high -level accuracy when making a ring.Design for lathe.It is also applicable to drilling bits.Compared with ordinary steel, it has higher strength and is not easy to deform. Colour:As Shown Material:Stainless steel Package Contents: 1 set x Ring Stretcher 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.