double head hex bolts with drilled holes-for floor mat of treadmill_sporting equipment specification: 3/8-16*20 Finishing: Colored-plating Material:10B21 1.Product:Baosteel raw material make sure the product good toughness and high strength,quality meets the demand of International European Union standards. 2..Application：this kind of product is for fitness equipment-----treadmill,Weightlifting Bed Series,The bench press frame,Barbell bed.ski tools,Cushioning pads of the treadmill,ski tools. 3.we also can give your suggestion and design according to your drawings and samples. .Any specific screws can be provided according to customers' requirements . All the NON STANDARD FASTENERS are customized. 4. FREE SAMPLES can be sent on request. Come to see us,Let's talk more details.