3 PIECE 2-3/4 TO 3-3/4" X 17" ARBOR EXPANDING MANDREL (3902-3078)

3 Piece 2-3/4 to 3-3/4" with 17" Arbor & 7" Sleeve Expanding Mandrel Set Center holes are ground and lapped. Made of 64Mn high grade tool steel. Precision ground and heat treated for maximum concentricity and holding power. Arbors are tapered and sleeves are flexible. The automatic expansion feature can be utilized on any bore (standard or non-standard) within the range of the mandrel. Size is obtained by moving the sleeve along the arbor. Set has 2 expanding sleeves and one mandrel. Arbor hardness is HRC55-60 and sleeve is HRC44-48. Shipping Weight: 42 lbs