Here's what other sites are saying:
The Grivel Trigger can be attached to the shaft of nearly any ice tool for added support while climbing. This highly adjustable attachment allows easy matching for mixed climbing, a place to choke up on your tool, and protection for your knuckles from bashing into the ice. The yellow fits shafts up to 20 x 30mm and the black fits larger sizes.
Grivel Trigger - Standard Grivel's invention mounted on the Top Machine in 2000 is now available for tubes of all diameters: in yellow for all tubes up to 20 x 30mm in diameter and in black for larger sizes. It can be regulated at any point and distributes the weight over the fingers.
For added support while climbing, attach the Trigger from Grivel to the shaft of just about any ice tool. This adjustable component can be attached at any point on the shaft of a tool to support the index finger or the entire hand - great for matching.
- Mountain Gear