Features:OOTDTY Make of carbon metallic materials, with precise craftsmanships, smooth, no burrs, corrosion and rusts resistance, now not easily to break / deforms, and Enduring.Mainly used to fix kit that is often disassembled, fasteners within the mechanical industry, installed in mating key way, compatible for pulleys and shafts applications, and transmit torques between shafts and hubs / bushings.Easily to Store: All feather key is shop in a transparent and sturdys garage field with compartments.All Key Stock is all make by extremely precisions process center. Suitable for pulleys and shafts applications, they usually is acceptable for hubs adjustment.Easily to carry, clear-cut operate, stable function, extremely accuracy, good 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 errors because of guide measurement, make in reality that you just now not intellect before order. Due to distinction between varied monitors, the picture won't replicate the actual color.