These sight screws are custom made . They are cold-headed and heat-treated to HRC 39-45, and feature a corrosion resistant Black Oxide finish.
Each screw has a Nylok® Torq-Patch® applied to the threads. Nylok® Torq-Patch® is a self-locking nylon permanently bonded onto the threads that resists vibration loosening.
Since nylon has great memory characteristics, this locking element can be reused several times.
Contact:Mr Liu
Mobile:15869109368
Tel:86-571-89967020
E-mail:info@dawopu.com
Address:No151 ,ZiDingXiang Rd, Hangzhou. Zhejiang Province, China