↑ Set 155, 556, 285, 156, 286-287: Peck Crackers; A4, A5, A7, A9, A12, A16

• Made in England [1960s – 1970s].
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Cracker numbering is diameter in 1/16 inch units.

↑ 155: Peck Cracker; A4

• Made in England [1960s].
• Size: 6.7 mm.
• Weight: 15 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "PECK" on one end.
• Cracker numbering is diameter in 1/16 inch units.

↑ 665: Peck Cracker; A5

• Made in England [1960s].
• Size: 8 mm.
• Weight: 25 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "PECK" on one end and "A5" on the other.
• Cracker numbering is diameter in 1/16 inch units.

↑ 284: Peck Cracker; A5

• Made in England [1960s].
• Size: 8 mm.
• Weight: 25 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "PECK" on one end.
• Cracker numbering is diameter in 1/16 inch units.

↑ 285: Peck Cracker; A7

• Made in England [1960s].
• Size: 11 mm.
• Weight: 40 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "U," "PECK," and "K" on one end and "A7" on the other.
• Cracker numbering is diameter in 1/16 inch units.

↑ 156: Peck Cracker; A9

• Made in England [1960s].
• Size: 14 mm.
• Weight: 42 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "U," "PECK," and "K" on one end and "A9" on the other.
• Cracker numbering is diameter in 1/16 inch units.

↑ 286: Peck Cracker; A12

• Made in England [1960s].
• Size: 19 mm.
• Weight: 70 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "PECK" on one end and "A12" on the other.
• Cracker numbering is diameter in 1/16 inch units.

↑ 287: Peck Cracker; A16

• Made in England [1960s].
• Size: 35 mm.
• Weight: 93 g.
• Ends are not tapered, reducing the nut's versatility.
• Aluminum alloy.
• Stamped "PECK" on one end and "A16" on the other.
• Cracker numbering is diameter in 1/16 inch units.