Features:OOTDTY Make of carbon metal materials, with exact craftsmanships, smooth, no burrs, corrosion and rusts resistance, now not smoothly to break / deforms, and Enduring.Mainly used to repair kit that's often disassembled, fasteners in the mechanical industry, installed in mating key way, appropriate for pulleys and shafts applications, and transmit torques between shafts and hubs / bushings.Easily to Store: All feather secret's shop in a clear and sturdys garage box with compartments.All Key Stock is all make by highly precisions job center. Suitable for pulleys and shafts applications, they usually is suitable for hubs adjustment.Easily to carry, clear-cut operate, solid function, extremely accuracy, nice repeatability!Specifications:Materials: Carbon SteelSize: As Show In The PicturePackage Includes:10Pcs 3x3x8mm10Pcs 3x3x10mm10Pcs 3x3x12mm10Pcs 3x3x16mm10Pcs 4x4x10mm10Pcs 4x4x12mm10Pcs 4x4x16mm10Pcs 4x4x20mm10Pcs 5x5x12mm10Pcs 5x5x16mm10Pcs 5x5x20mm10Pcs 5x5x25mm5Pcs 6x6x16mm5Pcs 6x6x20mm5Pcs 6x6x25mm5Pcs 6x6x30mmNote:Please enable 1-2cm mistakes because of guide measurement, make genuinely that you simply not intellect earlier than order. Due to difference between different monitors, the picture may not replicate the actual color.