Saker 3D Multi-Angle Measuring Square Ruler, Aluminum Alloy Carpenter Square, 0-90° Precision Hole Scribing Ruler with Angle Pin for Woodworking, Engineering, and Construction Projects 4.4inch Size:4.4inch it holds the holder in

it holds the holder in place on your arm while keeping the upper and lower ball joints extremely flexible

VERSATILE POWER SUPPLY: Operates on 10-36VDC with 2-wire normally open output

Two Kinds of Installation Methods:With 3M self-adhesive tape (included) and can be installed on almost all vertical surfaces

which enhances its flexibility

Saker 3D Multi-Angle Measuring Square Ruler, Aluminum Alloy Carpenter Square, 0-90° Precision Hole Scribing Ruler with Angle Pin for Woodworking, Engineering, and Construction Projects 4.4inch Size:4.4inch it holds the holder inSaker 3D Multi Angle Measuring Square Ruler, Aluminum Alloy Carpenter Square, 0 90 Precision Hole Scribing Ruler with Angle Pin for Woodworking, Engineering, and Construction Projects Product Features Durable Aluminum Build: Crafted from anodized aluminum alloy, the Saker carpenter square offers long lasting durability, corrosion resistance, and wear proof performance. Its laser engraved 3D scales on three edges provide clear, fade resistant markings,