toothed ring dowel 齿环接钉

spring ring dowel 弹性环销

stepped ring dowel 阶式圈桦

spiked ring dowel 压环接钉

Split-ring dowel 断圈式榫

Spring-ring dowel 弹性环榫

Closed-ring dowel 接木环

apple ring dowel 楔形暗销

closed ring dowel 闭口环榫

Dowel spring-ring 弹性环榫