32 and the outer diameter r od of the split wear ring 30 as shown most clearly in fig4 the retainer ring 32 is seated against the rearward portion of the split wear ring 30 at the rear edge of the annular channel 19 the braze ring 34 is seated against the forward portion of the split wear ring 30 and the forward edge of the annular channel 19 the beveled cross sectional shape of the split wear ring 30 helps maintain the retainer ring 32 and braze ring 34 in their respective positions shown in fig4 in addition to the split wear rings 30 of the present invention additional ribs flutes veins and or dimples may be attached to the tool body 12 either independently or in conjunction with the split wear ring 30 the ribs flutes veins and or dimples may be harder than the steel body 12 and may be made from similar materials as the split wear ring 30 such ribs flutes veins and or dimples may be used to protect the steel body 12 from erosion e g caused by cutting of asphalt material and to aid in rotation of the tool the retainer ring 32 holds the split wear ring segments 30 a in place when going through the braze coil or other brazing operations the wear ring segments 30 a will tend to move apart by the magnetic action of the braze coil and the floating effect of the braze material if not held in place by the retainer ring this aids in assembly operators do not need to hold the wear ring segments 30 a together while the braze ring 34 melts which avoids safety issues associated with operators placing their hands in the braze coil during.