The Stiletto TBM-R is a 4 oz replacement milled hammer face for TBII-15 model hammers. The replacement hammer face has a durable steel milled face for gripping nail heads to prevent slipping. The replacement kit contains a replacement steel face, bolt, hex key, lock-washer, Loctite bottle, instructions and leather washer part (for older t-bones). The TBM-R replacement face is made of heat treated high-carbon steel for long service life.