$19.99 .50 Caliber Pen Holder 50 Caliber Pen Holder •A big pistol cylinder to sit on your desk and hold your pens and other skinny accessories. •Cast aluminum. •Six chambers for holding stuff. •Dimensions: ◦Outer dimensions: approx. 3.75" diameter x 3.6" tall. ◦Chamber dimensions: approx. 0.75" diameter x 3.4: deep.