Optical tube binocular(20? inclined)
Eyepiece(wide field) 10X (view field .87″ DIA)
Objective 0.8X~8X (zoom)
Zoom ratio 1:10
Infinity parallel optical system and 20? inclined optical tube reduce fatigue.
Coaxial illumination is optical for deep holes that cannot be observed by ring light.
Aperture diaphragm is optional for large depth for dield and high quality image.

3M 27313, Ultra Durable 5 inch Power Sanding Discs, Universal Hole, 60 grit, 7100187645, 10 per pack
Dynabrade 95675 1/4" Male Plug with 1/4" NPT Male Thread
Dynabrade 94992 1/4" Male Composite-Style Coupler with 1/4" Male Plug Assembly
3M 65490, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc, DUH580TRI-10T, 5 IN x UH, 80, 7100202914, 10 per pack
3M 65489, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc DUH5120TRI-10I, 5 inch UH, 120, 7100202873, 10 per pack
3M 22586, Neoprene High Performance Contact Adhesive 1357, Light Yellow, 1 Gallon Can , 7000046325, 4/case 