Aluminum painted black

one is new with tool in bag, one is used

brown rubberized top

50 mm  l x 36 mm w x 10 mm h

screw in center at 18 mm x 25 mm

screw on used plate 6 mm diameter

screw on new plate 8-9 mm diameter

screw controlled from underneath

push button on side

weighs 4.4 oz.

manufacturer unknown