Head type (Alternate names) Round Size 3 BA (British Association) Shank diameter nominal 0.161" (4.1mm) Pitch 34.8 tpi Length (measured from under the head) 1/2" ...
To suit Lucas Wiper Boxes as fitted to the below vehicles
Austin Healey BN2 BN4 BN6 BN7 BT7 BJ7 BJ8
Austin Healey Sprite MKI MKII
MINI Cooper MKI MKII 998cc 1959-1968
MGA 1500 1600 1600 MKII
MGB 1962-1963 to roadster to (c)6916