This expert drill comprehensive kit is suitable for many applications. Display packed in plastic case with rubber surround. 15 x titanium coated hexagon drive HSS twist drills diameter: 1-8mm, 4 x 1/4"" plain slot insert bits size: 4-7mm, 8 x 1/4"" cross slot insert bits: No.0-3, 8 x 1/4"" PZ TYPE insert bits: No.0-3, 4 x 1/4"" Draper TX-STAR insert bits: T10-T30