We are offering 3.5mm cortex screw. We are matireal s.s 316l & titanium. size: 10mm to 50mm ( 2mm var.) 50mm to 80mm ( 5mm var.) available in titanium alloy (as per iso 5832-3) & stainless steel aisi 316 l. Thread diameter : 3.5mm core diameter : 2.4mm hexagonal socket : 2.5mm head diameter : 6.0mm