Technicians StandardsDescription Technicians Standard Pair Designed to aid hammer voicing reshaping on upright pianos, either in the piano itself or on a workbench. The longest setting on the standard is approximately 141mm and can be adjusted down to 124mm. Included with the standards are magnetic feet to help reduce the chance of damage on a tabletop or bench, All of this is conveniently stored in our own branded organic cotton drawstring bag. Technicians Standard