Specifications: 1) Frame dimensions: a) 50 x 50 x 15mm b) 70 x 70 x 25mm c) 75 x 75 x 30mm d) 97 x 94 x 33mm e) 120 x 120 x 25mm f) 120 x 120 x 32mm 2) Rated voltage: 5V, 12V, 24V, 48V 3) Bearing: sleeve, ball bearing Inner packing: Box