Features Double fine adjustment.Bottom: unique single directionTop: universal swivel clampHolds 6mm, 8mm, 3/8", dovetail and back lug.Unique central locking mechanism with Noga designed spring loaded bearing.Instantly fastens in any position.Fast and easy to set up gauges into required position.Aluminum material with black finished arms.5 axis holder.Notes ?Indicator Not Included.NOGA Holder with Double Fine Adjustment - Model: MG6161