詳細規格及用途描述
There are different thread forms that suits specific purpose for the Window screws which has a sharp point or a drilling point is good for fast driving, and this kind of window screws is also endurable being connected with varied material objects. It is designed for good function of sharp point to UPVC plate and drilling point to iron plate within a limitary time under the requirements suchlike the thickness of UPVC/Iron plate, driving time and R.P.M.