Blind rivet nuts Hexagonal flush head - open end - type zinc plated steel M6 Grip range 0.5 to 3mm 9000 pcs. M4 Grip range 0.5 to 3mm 300 pcs. M5 Grip range 0.5 to 3mm 600 pcs. M8 Grip range 0.5 to 3mm 3000 pcs.