SUNWAYFOTO DDP-64SIX Indexing Rotator, CNC cutting machine from light weight aircraft-grade aluminum, stain anodized surface finish for better abrasion and corrosion resistant.
Complete set of 5 detent interval options:
8(45 stops), 12(30 stops), 15(24 stops), 18(20 stops)
 
Stops around= 45, 30, 24, 20
Degrees= 8, 12, 15, 18
Product Features:

Two Knobs for locking top platform and panning base rotation;
Detent interval can be changed easily;
Ideal for making HDR(High-Dynamic Range) panorama;
Can be used as a normal panning base;

Note:Both of lockingCaptive Knob can be adjusted at different positions. If the Captive Locking Knob Lever interferes with other equipment when turned, you may pull out the knob, and relocate it in a more convenient position.