Gibraltar

1 5/8 (41 mm) tension rods
Fits many snare drums, small and medium toms, and some floor toms. (6PK, w/washers)

Tension Rods Reference Guide:
Key Rod - Tension rod with drum key style head. Generally used on snare drums, tom toms, and at the bottom of a bass drum.
T-Rod - Tension rod with T-handle. Used on bass drums.
Diameters
7/32" - Fits tom and snares for Pearl, CB, Mapex, Tama, Ludwig, Gretsch, Premier, Pacific, and most other manufacturers with the exception of Sonor. Fits DW drums prior to 1996 production.
6 mm - Fits bass drums for Pearl, CB, Mapex, Tama, Ludwig, Gretsch, Yamaha, and other generic Taiwan-made drums. Other manufacturers generally use 7/32" dis b ss drum key rods.
Lengths
SC-4J - 1 3/8" (35 mm), Fits many piccolo snare drums and small tom toms.
SC-4C - 1 5/8" (41 mm), Fits many snare drums,. small and medium toms, and some floor toms.
SC-4B - 2" (51 mm), Fits toms and floor toms with a lot of space between hoop and tension casing.
SC-4E - 2 3/8" (58mm), Fits some floor toms and bass drums.