Cast Aluminum Square Hole Drill Bit Adapter ($11.99)

Your lowest option: $11.99 via Banggood.. Cast Aluminum Square Hole Drill Bit Adapter for Hand Electric Drills Easy Installation Durable Woodworking Tool with Precise 20mm Width 38-43mm Diameter Fitment Quick and Smooth Drilling.
Updated: 16-09-2025

Banggood

Warehouse in China.
Direct URL: Cast Aluminum Square Hole Drill Bit Adapter
Price: $11.99

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Aliexpress

There’re some similar (or not) items on Aliexpress

Image	Product (link)	Price	Coupons
	Square Hole Drill Fixed Bracket Aluminum Cast Iron Mortising Attachment	$8.25	–
	Square Hole Drill Bit Adapter Attachment Cast Aluminum Quickly Install or Disassemble Mortise Tool for Hand Electric Drill	$15.46	–
	Square Hole Drill Fixed Bracket Aluminum Cast Iron Easy to Install Professional High Performance Accessories Woodworking Tool	$18.91	–

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