Most Often Needed Radio Diagrams, Volume 1
by M. N. BeitmanRadio Diagrams and Servicing Information from 1926 to 1938. Shows circuit diagrams for 600 of the most commonly found radios of that time. A valuable resource for restorations.
Screw - M4 x 0.70, Phillips, Pan Head, Stainless Steel, Machine
Package of 4(Metric Threading: M4 x 0.70) - 20 mm long