this included spiked steel wheels , the size of a silver dollar , which could be whirled on the finger and thrown , chains with spiked weights at each end , used like the south american bolas for catching cattle , sharp nails twisted into knots for defeating barefoot pursuers ( bond remembered similar devices spread on the roads by the resistance to puncture the tyres of german staff cars ) , hollowed bamboo for breathing under water ( bond had used the same device during an adventure on a caribbean island ) , varieties of brass knuckles , gloves whose palms were studded with very sharp , slightly hooked nails for 'walking ' up walls and across ceilings , and a host of similar rather primitive gadgets of offence and defence .