KNOBS
6 3-Prong
7 4-Prong / 4-Lobe
8 Star
8 Ergo Star
9 Fluted
10 Tapered
10 Push / Pull
11 Ball
12 T
13 Knurled
14 Snap-Lock
15 Press-On Thumb Screws
17 Universal Ball / Tapered
18 Press Fit
19 Metal Knurled
19 Quick Release
20 Control
20 Pointer
21 Pad Printing & Laser Etching
21 Custom Molding