; It's important to have a clean block - especially in critical hard-to-get-at areas of the oiling system; Each brush is designed for a specific purpose; there are two each of the oil gallery brushes since they get the most wear; Can also be used on crankshaft oil holes, cylinder heads, etc; bristles are made of nylon which cleans as well as wire but does not scratch; Set of 12 brushes INCLUDES TWO OF EACH: 1/4 diameter, 2 long brush, 10 handle 5/16 diameter, 2-1/2 long brush, 12 handle 3/8 diameter, 2-1/2 long brush, 12 handle INCLUDES ONE OF EACH: 1/2 diameter, 2-1/2 long brush, 34 handle 5/8 diameter, 3 long brush, 34 handle 3/4 diameter, 3 long brush, 34 handle 7/8 diameter, 3 long brush, 12 handle 1-1/4 diameter, 4 long brush, 12 handle 5 diameter, 7 long brush, 18 handle

• Nylon Bristles clean as well as wire but do not scratch
• Set of 12 brushes
• INCLUDES (2): 2L, 2.5L (5/16 dia), & 2.5L (3/8 dia) Brushes
• INCLUDES (1): 2.5L (1/2 dia), 3L (5/8 dia), 3L (3/4 dia), 3L (7/8 dia), 4L, & 7L Brushes

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Information:

It's important to have a clean block - especially in critical hard-to-get-at areas of the oiling system; Each brush is designed for a specific purpose; there are two each of the oil gallery brushes since they get the most wear; Can also be used on crankshaft oil holes, cylinder heads, etc.; bristles are made of nylon which cleans as well as wire but does not scratch; Set of 12 brushes; INCLUDES TWO OF EACH: 2 Long Brush (1/4 diameter, 10 handle), 2-1/2 Long Brush (5/16 diameter, 12 handle), 2-1/2 Long Brush (3/8 diameter, 12 handle); INCLUDES ONE OF EACH: 2-1/2 Long brush (1/2 diameter, 34 handle), 3 Long Brush (5/8 diameter, 34 handle), 3 Long Brush (3/4 diameter, 34 handle), 3 Long Brush (7/8 diameter, 12 handle), 4 Long Brush (1-1/4 diameter, 12 handle), 7 Long Brush (5 diameter, 18 handle).