Guide Wireless Minimally Invasive Screws (Pedical) 1.Minimaly Invasive Screws Without Guide Wire. 2.Diameter Size Should Have Of 4.5 Mm, 5.0 Mm, 6.0 Mm, 7.0 Mm, 7.5 Mm. 3.Length Should Be 30 Mm, 35 Mm, 40 Mm, 45 Mm, 50 Mm, 55 Mm, 60 Mm. 4.Should Be Compatible With 5.5 Mm Diameter Rod System. 5 Usfda,Ce Approved