Easy to install (can be directly swapped on most telescopes with 96mm diameter tube). Eg: Skywatcher ED80/ED100 and others.
10:1 reduction gives ultra precise control for focusing at even the highest practical magnifications.
Scale on drawtube allows you to return to a particular focus point easily.
Makes webcam/planetary imaging less frustrating.
Has two mounting holes to attach finderscope bracket on right or left hand side of the focuser.
Tensioning screws allow you to adjust the drawtube tension to suit heavy loads or provide easy movement with light accessories.