Quantity-20/100 Full Product Dimensions: 9X17x2cm. Range Covers: 3-6Mm(1/8’’-1/4’’), 6-8Mm (1/4’’-5/16’’), 8-11Mm . (5/16’’-7/16’’), 11-14Mm (7/16’’-9/16’’) . & 14-19Mm (9/16’’-3/4’’) For Removing Damaged Screws Or Bolts. Comes In Plastic Case.