Stainless Steel 1/4" Flathead Screw FS-1 10mm Shaft 4mm Allen Head 2 x 1/4 Screw FS-1 4mm Hex Head. Stainless steel for superior strength.1/4 metal male thread w/ 4mm hex socket. Threaded Shaft is 7mm in length.Total length including base is 10.2mm. Identical to the screws provided with DDH-01. Stainless Steel 10 Pack Super-Strong 4mm Hex Head.