Head type: roundMaterial: carbon steelStandard Type: National StandardCategory: machine screwsColor classification: M2 * 3 [500 pieces] M2 * 4 [500 pieces] M2 * 5 [500 pieces] M2 * 6 [500 pieces] M2 * 8 [500 pieces] M2 * 10 [500 pieces] M2 * 12 [500 Pieces] M2.5 * 4 [500 pieces] M2.5 * 5 [500 pieces] M2.5 * 6 [500 pieces] M2.5 * 8 [500 pieces] M2.5 * 10 [500 pieces] M2.5 * 12 [500] M3 * 4 [500] M3 * 5 [500] M3 * 6 [500] M3 * 8 [500] M3 * 10 [500] M3 * 12 [500] M4 * 6 [500 pieces] M4 * 8 [500 pieces] M4 * 10 [500 pieces] M4 * 12 [500 pieces] M4 * 16 [500 pieces]Model: Black Round Head Screw with Pad M2M2.5M3M4