6 PCS Set 1/4" to 3/4" SHANK RH SCLCR INDEXABLE BORING BAR TOOL HOLDER WITH 6 PCS TCMT INSERTS FOR STEEL. HOLDER TYPE: INDEXABLE MATERIAL: HIGH SPEED STEEL. 6PCS 1/4-3/4 BORING BAR HOLDER. BORING LENGTH (max): 8.0.