12 in x 18 in x 1/4 in Solid Aluminum Optical Breadboard

12" x 18" x 1/4" Solid Aluminum Optical Breadboard, Black Anodized. Each aluminum breadboard has 1/4-20 tapped holes on 1 inch centers. Includes 5 countersink mounting holes. Base Lab Tools slim design aluminum breadboards are ideal in applications with strict space & weight restrictions. This 12" x 18" solid aluminum optical breadboard weighs just 5 lbs.