Fowler Surface Gage a popular tool for layout, transfer and measurement work. The base of Fowler's Surface Gage is hardened throughout and features a V-groove for use on round shafts or flat surfaces.Fine adjustments may be obtained for quick and accurate settings with the knurled thumb screw.Spindles are available in 4" , 7" , 9" and 12" lengths.Retractable pins in base for work on flat surfaces.A V-groove is incorporated in the ground steel base for mounting on round work.Fine adjustment of the spindle may be made to any angle above or below the base.The scriber head also features a spring control.Double-ended scriber included.Base is fully hardened throughout.Available in standard size and mini-model version.Clamp can also hold test indicator stems.