... requirement size :1/4--3/4",m4-m14 square head bolts standard: JIS ,ASTM,DIN ,BS or per customers ... or samples. Product rangeBOLTS: hex bolts, heavy hex bolts, hex flange bolts, carrage bolts, wheel bolts, stud boltsNUTS: hex nuts, heavy hex nuts, hex flange nuts, nylon insert lock ... screws, self tapping screws, set screws, hex socket head cap screws, woodscrews, self drilling screwsChain and cable