Please check the compatible model for jaws replacement for hand riveters, air riveters, electric riveters, and cordless riveters. Please check the compatible model and use super hard jaws especially when using stainless rivets (NSS,NST). Caution and Conditions: When using stainless steel rivets (NSS and NST), please use super hard jaws. Please check the compatible model before using the jaws for hand riveters, air riveters, electric riveters, and cordless riveters.