1)the product is used on yacht, boat, ship. 2)material:stainless steel 316 or 304. 3)surface:mirror polishing. 4)specification: NO. Base WT(g) XH0200B 7/8" 345 XH0200C 1" 375 Our company mainly manufactures various kinds of stainless steel marine hardware If you are interested in our products,please contact us.Thank you.