1.spider for glass fitting, it's usually for the glass curtainl wall. 2.Fixing the glass 3.Durable 1.spider for glass fitting, it's usually for the glass curtainl wall. Can be use in the commercial building, office building etc.2.Fixing the glass3.Durable4.Material is stainless steel5.Have one claw, two claws, three claws, four claws ,five claws.