Specification:
Origin: Mainland China
Type: Combination
DIY Supplies: Woodworking
Application: Wood Working Tool
Model Number: Dowel Maker Jig
Round hole specification: Diameter: 8/9/10/12/15/16/18/20(mm) 
Product material: CNC aluminum alloy / anodized treatment
Blade material: discarded carbide blade
Blade specification: 15*15*2.5 30°R150
Drill diameter: 4mm
Round nail head:
Hexagonal shank: Width across sides 9mm, diagonal Diameter 10mm (electric drill must be able to hold more than 10mm)
Self-tapping end: wood bottom hole 4mm
Overall length: about 42mm
Product size: about 85.00x80.00x50.00mm (3.35x3.15x1.97inch)