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1. High speed steel., 2. Spiral flute., 3. 7 degree Helix left hand spiral. - details see: https://www.machineto.com/hss-hand-reamers-10150084

Hand reamers have a square on the end of the shank which allows placement into a wrench which the user rotates by hand.

Used for opening out and finishing existing holes to H7 tolerance in most ferrous and non-ferrous metals.

Flute Geometry - 7° Helix left hand spiral.

To obtain the best results when using reamers it is essential to make them work. It is a common fault to prepare holes for reaming with too little stock left in. If insufficient stock is left in the hole before reaming then the reamer will rub quickly, show wear and will result in loss of diameter. It is equally important for performance not to leave too much stock in the hole.

Heading: 4mm 5mm 10mm 12mm