Drill Bit extension for Baum & Nygren Dahly Drill Heads.

Compatible with 1/4", 9/32" and 5/16" diameter drill bits

1.43" Height x 0.443" OD x 0.370" thread width

Equivalent to mfg. # N-37
See E-1 for 1/8" diameter bits or E-2 for 5/32" to 7/32" diameter bits.