MATERIAL - The spindle center is made of high quality steel, which is durable and has excellent marking function. It can be used for hardwood and softwood. Chrome surface, wear-resistant, corrosion-resistant, necessary for carpentry, very easy to store and maintain. Easy to use: All you have to do is drill a set of holes, insert the dowel positioning centering pins and press another wooden panel over the joint. The locator dots will precisely mark the hole locations on the other part. Different models: The spindle center has four different sizes of 6mm, 8mm, 10mm and 12mm. Three pins for each size. Can meet your needs.which correspond to daily needs, the essential sizes ensure you the different installations of furniture or artist objects. PRECISE ALIGNMENT: The wooden dowel pick can help you drill two aligned holes on two wooden plates, so as to install the wooden dowels well. The small and portable tool can do its job just like larger instruments. Wide Application: Dowel alignment positioners are used for installation of closet, cabinet, table, bed, book shelf etc. They are also suitable for DIY wood crafts, they are practical and economical. Quantity delivered: 32 pieces (dimensions: 4*6mm, 4*8mm, 4*10mm, 4*12mm) WARM NOTE: Please allow 1-2mm error by manual measurement Item color displayed in photos may show something different on computer Monitor Calibration as monitors are not the same