Features:OOTDTY Brand new and excessive qualityMade of carbon metal material, with exact craftsmanship, smooth, no burrs, corrosion and rust resistance, difficult to interrupt or deform, and durable.Mainly used to repair kit that is often disassembled, fasteners in the machinery industry, or installed in mating keyways, designed for pulley and shaft applications, and transmit torque between shafts and hubs or bushings.Easy to Store: All keys are kept in a transparent and sturdy storage box with compartments.All Key Stock are all made by means of high activity center.Designed for pulleys and shaft applications, and they are appropriate for hub adjustment.Easy to carry, straight forward operation, stable function, high accuracy, good repeatability!Specifications:Material: Carbon SteelSize: As Shown In The PicturePackage Includes:10Pcs 3x3x8mm10Pcs 3x3x10mm10 Pcs 3x3x12mm10 Pcs 3x3x16mm10 Pcs 4x4x10mm10 Pcs 4x4x12mm10 Pcs 4x4x16mm10 Pcs 4x4x20mm10 Pcs 5x5x12mm10 Pcs 5x5x16mm10 Pcs 5x5x20mm10 Pcs 5x5x25mm5Pcs 6x6x16mm5Pcs 6x6x20mm5Pcs 6x6x25mm5Pcs 6x6x30mmNote:Please allow 1-2cm errors because of manual measurement, just remember to don't intellect earlier than you order. Due to the adaptation between assorted monitors, the picture may not replicate the particular coloration of the item.