This stopper type has a serrated contact area on both sides of the stop module.
The contact area is nitrided.
One popular variation is a stopper RMS-SR2 which has one serrated (R2) and one smooth (S) jaw.
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.