Features:

[Package] Pack of 4, different size meet your multiple choice. Diameter size include 1/4, 3/8, 1/2, 5/8 inch (6mm, 10mm, 13mm, 16mm)

[Easy to Use] The handle of the insert is round and easy to use. The drill guide bits can be replaced so more convenient.

[Material] Made of steel material, not easy to wear, durable and lasting performance. It's a great substitute for your product.

[Function] A plug is a woodworking or joinery tool used to cut wooden plugs to fill and repair gaps in wooden items.

A plug cuts a tapered hole into a surface, the plug is then snapped off from the wood remaining in the hole, their tapered shape allows them to be coated with glue and pushed firmly into a hole. 

Specification:

Material：45 # carbon steel
Size：
1/4" Take wood(dia) 6.3mm
3/8" Take wood 9.5mm
1/2" Take wood 12.7mm
5/8" Take wood 15.8mm
shank：10mm
can get block up to 27mm

Package list:

Drill bits X 4PCS