Size: Length 37.5 cm. Width: 20 cm. Height: 32 cm
Finger prehension device
4 bolts of different grip sizes: 20 mm. 17 mm. 12 mm. 10 mm
To grip with thumb and finger and screw the bolt up and down.
Space between threaded metal rods: 9 cm
Height of threaded metal rods: 27 cm
