DIMENSIONS & FEATURES:- SIZES- 15, 20, 25, 30 AND 35MM ROUND SHANK ALLOWS USE IN DRILLS WITH A 1/2'' CHUCK. WE RECOMMEND THE USE OF A DRILL STAND. PLEASE ENSURE THE WORKPIECE IS FULLY CLAMPED BEFORE DRILLING. CASE QUANTITY 40, NO INNERS FULL PRODUCT DIMENSIONS 17x12x5