# 1: 1/2" Sq. Drive Impact Stud Driver. Size: M12 X1.75 Pitch. Qty: 150 Nos , # 2: 1/2" Sq. Drive Impactstud Driver. Size: M16 X 2.00 Pitch. Qty: 80 Nos. , # 3:1/2" Sq. Drive Impact Stud Driver. Size: M20 X 2.00Pitch. Qty: 100 Nos. Quantity: 330