The Simpson Strong-Tie ETBS-TH T-handle is required for use with all sizes of Simpson's standard wire brush. This T-handle attaches to the brush head and cleans holes up to 13-1/2" deep. These brushes are excellent for cleaning drilled holes before installing adhesive anchors. The brush head is designed for use with the Simpson SET-3G™ adhesive. To obtain the total usable length, add the usable length for each part used.