With different edge configurations, this stone will sharpen just about any carving tool from gouges to V-grooves. 1 edge is shaped round and tapers from approximately 1/8" to 1/2". The other edge is straight and has an angled taper. Stones measure approximately 2" x 4". No. 340-1775: Length: 4", Width: 2", Depth: 1/8" to 1/2"