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Rods and lugs
Placed vertically through
the holes in the [hoops] are tension rods which are basically bolts, threaded at
one end and sporting a square top at the other to accept a drum tuning key.
Older kits tended to use slotted tops (like the top of a screw) however these
are not generally manufactured for modern drums.
A tension rod fits into a
'lug' or 'nut box' that contains a threaded barrel into which the tension rod is
screwed. The nut boxes are attached directly to the shell of the drum, the
exception being free-floating shells where the lugs fix to a ring on the bottom
edge of the drum. Over recent years as players become more demanding and the
understanding of how drums operate is becoming increasingly applied,
manufacturers have been seeking to reduce the amount of lug contact points and
the 'footprint' of each lug contact point. This is working towards permitting
the drum shell to resonate more freely and put more of the sound of the wood
into the drum. Many manufacturers have developed 'low-mass' lugs expressly for
this purpose.
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The Drumset 
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