and an outer wall surface the housing is secured to the outer wall surface of the mandrel and comprises an opening the sleeve is engaged with the outer wall surface of the mandrel the sleeve comprises a profile that is operatively associated with a profile of the cutting blade such that movement of the sleeve causes the profile of the piston to slide along the profile of the cutting blade in so doing the cutting blade is radially extended outward through the opening in the housing to abrade an object located outside the housing movement of the sleeve can be achieved by pumping fluid down a bore in the mandrel to slide the sleeve long the outer wall surface of the mandrel application_number US 93094811 A description referring now to fig1 6 downhole cutting tool 10 comprises mandrel 20 having upper end 22 lower end 24 and bore 26 disposed longitudinally therein mandrel 20 is adapted at upper end 22 to be connected to drill or work string not shown such as through threads not shown mandrel 20 includes outer wall surface 28 longitudinal axis 29 shoulder 30 for supporting cutting blade 70 when tool 10 is in the run in position fig1 and ports 32 disposed through outer wall surface 28 and in fluid communication with bore 26 in the embodiment of fig1 6 outer wall surface 28 also includes lower shoulder 34 secured to outer wall surface 28 of mandrel 20 is upper gage ring 40 and lower gage ring 42 upper gage ring 40 and lower gage ring 42 can be secured to mandrel 20 through any method or device know in the art such as threads not shown upper gage ring 40 and lower gage.