Related Clues:

• Carpenters' hits?
• Symbols of toughness
• Pins
• Tacks
• Toughness exemplar
• Fastens securely
• Metal spikes
• Hardened skin growths at base of fingernails
• Horny plates of the digits
• Slain with metal pins
• Horny plates and pointed pins
• They may be driven by five-in-hand
• They may be driven five-in-hand (5)
• They may be driven five-in-hand
• They have a point: the North gets sick of them