Esun-XA2104-way Spider for Glass Curtain Wall is made of stainless steel grade 304/316,and they can be adopted in glass curtain wall structures of all kinds. Axial load for single arm(negative wind load):4500N (max) Radial load for single arm(gravity):2000N (max) The material of spiders are made of investment casting austenitic stainless steel(304 or 316) The surface treatment:Polish(mirror,Satin),bright shot blasting finish, chemical polish and paint spraying(various colours). We can offer professional products and services in accordance with various needs your want.