How are self drilling screws measured?They are measured from the top of the head to the tip. Hex and hex washer head screws and bolts, although flat on the top and the bottom, are measured from the bottom of the head. From that point to the tip is the length of the screw. Self drilling screws are measured all the way to the end of the drill point tip.

Q1:Could you send me your catalogue and price list?A:As we have more than thousands of products, it is really too hard to send all of catalogue and price list for you. Please inform us the style you interested,we can offer the price list for your reference. Q2:How about the quality of your product? A:100% inspection during production. Our products are certified to ISO9001,TS16949 international quality standards.Q3:What material of the product can you supply? A:Carbon Steel,Alloy Steel,Stainless Steel,Brass,Copper or according to your requirement. Q4:What's the delivery time? A:For products in stock,we can ship it within 7 days after receiving your payment. For custom order,production time is 20-35 days after confirmed every details.Q5:What's your packing? A:Our Normal packing is bulkingin Cartons,25kgs/carton,36cartons/pallet. We also can pack products according to your requirement.Q6:What about the warranty? A:We are very confident in our products,and we pack them very well to make sure the goods in well protection To avoid anysubsequent trouble regarding quality issue, we suggest you check the goods once you receive them. If there is any transport damaged or quality issue, don't forget take the detail pictures and contact us as soon as possible,we will properly handle it to make sure your loss to reduce to the smallest.if it is our problem we will resposible for it.