Got mine off of eBay
1" x 1" x 2" with 10 deg bevel on one end. Rarely use beveled end and would rather not have it so that it is easier to feel when I am perpendicular to inside of wing skins. Works well with 3/32" or 1/8" rivets. Have not dinged a skin or my foot yet, but would imagine it could do alot of damage for its size. Worth every 10,000 pennies I paid for it. Bucked over 10,000 rivets with it so far. Pretty good ROI.