Adjustable socket wrench extension

An adjustable socket wrench extension, which comprises:

• (a) a first sleeve;
• (b) a substantially hollow female drive end secured to said first sleeve, for the reception of a drive end of a ratchet wrench;
• (c) a second sleeve telescopically received in said first sleeve;
• (d) a solid drive shaft telescopically received in said second sleeve and providing a means for removably receiving a socket that engages wit a nut or head of a bolt of a fastener;
• (e) a first locking collar and a second locking collar received on said first and second sleeves respectively, operable to engage said second sleeve and said drive shaft, respectively, for holding said first sleeve, said second sleeve, and said drive shaft extended;
• and
• (f) the first and second sleeves each having walls of substantially constant thickness and each wall being corrugated throughout its thickness defining alternating, longitudinally extending, tongues and grooves at equal radial spacings, the tongues and grooves on an inner surface of the first sleeve mating with respective grooves and tongues on an outer surface of the second sleeve and the tongues and grooves on an inner surface of the second sleeve mating with equally radially spaced grooves defined between equally radially spaced longitudinally extending ribs integrally joined with and projecting from said drive shaft;
• whereby the mating tongues and grooves and mating ribs and grooves permit relative longitudinal sliding movement while preventing relative rotation between said first sleeve and said second sleeve, and between said second sleeve and said drive shaft.