Features:8-piece air hammer rivet bit set, enough, satisfied for different demands.Complete set: 2 x springs, 6 x different air hammer rivet bits(hollow and half-hollow).High elasticity spring & each bit, made of high hardness 40Cr steel, sturdy, durable.The riveting tools, very suitable for 150mm, 190mm, 250mm air hammer.Application: building, automobile, ship, machine, home appliances, etc.Specifications:Material: 40Cr SteelColor: Dark GreyPackage Size: 13*7*5.5cm / 5.11*2.75*2.16inPackage Weight: 705g / 24.86ozNote:8-piece air hammer rivet bit set only, other accessories in the pictures are not included.Due to lighting or other reasons, the picture and material object may slightly differ.Due to manual measurement, there may be deviation, please in kind prevail.Packing List:6 * Air Hammer Rivet Bit2 * Spring