Type:10.9 Grade Alloy Steel Button Head Hex Socket Cap Bolts Screws. Drive Type: Hex Socket(4mm); Head Style: Button Head; Exterior Finish: Black Oxide; Thread Dia.: 6mm; Pitch: 1.0mm.NOTE: ALL SCREWS ARE COATED WITH ANTI-RUST OIL High Quality Material: 10.9 Grade alloy steel with corrosion resistant black oxide finish to ensure life-time use, these quality assortment screws for home, automotive, and shop use. They have excellent corrosion resistance, firmness, wear resistance and low temperature resistance. Package Included: M6 x 8mm(15PCS), M6 x 12mm(15PCS), M6 x 16mm(15PCS), M6 x 20mm(15PCS), M6 x 30mm(15PCS); Total: 75PCS. come with Allen key Wide Use: This button head Hex socket cap screws assortment are perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.for professionals, amateurs, landlords, repairmen, other DIY. The set is perfect to replace broken and missing screws. GUARANTEE:Whenever you need us, please contact us by email or Q&A. Satisfaction guaranteed. if not satisfied with the product Money back or exchange, please rest assured to buy.