Size:30mm diameter total piece and roughly 4mm diameter internal screw gap High Quality:Motor height base tools is product of High high quality plastic,blade base equipment is fabricated from quality rubber,These ingredients fit with Magic Bullet MB1001 250W only for security and sturdiness color:Black + clear Material:Plastic + Rubber Package Contents: four x rubber gears for under the blade 2 x plastic gears for the Motor base Only the above kit content, other merchandise aren't incorporated Note: Light shooting and varied displays may cause the colour of the thing in the photo a bit of diverse from the real thing The size allowed error is +/- 1-3cm