Sold as each. Chrome vanadium. 4 pc. set includes: No. 2 Phillips, No. 3 Phillips, 5/16" slotted, 3/8" slotted. For No. 1MD5 impact driver (SKU # 28667) or others. Manufacturer"s number: IMB4. Country of origin: Taiwan. Distributed by Great Neck Saw Mfg Co.