Size	Length
H1.5 H2 H2.5 H3 H4 H5 H5.5 H6	25mm - 30mm	1" - 1-1/5"
H1/16 H5/64 H3/32 H7/64 H1/8 H9/64 H5/32 H3/16 H7/32 H1/4	25mm - 30mm	1" - 1-1/5"